Improvement in sheet-metal-scroll cutters



w. H. CLARK, W. J. CLARK &'A. o. KITTREZDGE..

SHEET-METAL SCROLL-CUTTER.

No. 171,916. 1 Patented. Jan. 11,1876.

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N.PETERS. PHOTOLITHOGRAPHER, WASHINGTON, D C.

UNITED STATES.

PATENT WILLIAM H. CLARK, WILLIAM J. CLARK, AND ANSON O. KITTREDGE, OF

SALEM, OHIO, Assrenons TO THE KITTREDGE COMPANY, OF SAME PLACE.

IMPROVEMENT IN SHEET-METAL-SCROLL CUT TE RS Specification forming partof Letters Patent No. 171,916, dated January 11, 1876; application filedV v 'October 4, 1875. v

To all whom it may concern Be it known that we, W. H. CLARK, W. J.CLARK, and A. O. KITTREDGE, of Salem, in the county of Columbiana andState of Ohio, have invented a certain new and ImprovedSheet-Metal-Scroll Cutter; a nd we do hereby declare that the followingis a full, clear, and complete description thereof, reference being hadto the accompanying drawings making part of the same.

Figures 1 and 2 are side views of the scrollcutter. Fig. 3 is a planview. Figs. 4, 5, 6, and 7 are detached sections. v

Like letters of reference refer to like parts in the several views.

The nature of this invention relates to cutting scroll-work in sheetmetal; and the object thereof is to out said scrolls by a reciprocatingcutter in combination-with a stationary cutter, between which the sheetis moved in the line of the scroll-tracing, and thereby cut conjointlyby the two cutters, substantially in the manner as follows:

In the drawing, A represents a post or standard, to which is secured abracket, B, Fig. 3, in the part C of which is pivoted a vibrating head,D, a detached view of which is shown in Figs. 4 and 5. Said headconsists of two sections, a b, Fig. 4. Section or is pivoted in the partC of the bracket B by the eccentric shaft 0, whereon it vibrates. Thepart of said shaft on which the section a of the head vibrates iseccentric to the ends or journals of the shaft, which have their bearingin the sides of the bracket, as seen in Fig. 5. The purpose of theeccentricity of the shaft 0 will hereinafter be shown. Section b of thehead is connected to section a by a hinged joint, of which f, Fig. 5, isthe pivotal pin. To said pivotal pin is attached one end of aconnecting-rod, E, Fig. 2, whereas the opposite end of the rod isattached to a crankwheel, F, by a wrist-pin, G. Said wrist-pin issecured to the wheel by being fitted thereto in a dovetailed groove, 02,Figs. 1 and 2. A corresponding dovetail is formed on the pin, which issecured in the groove by a screw, '6, forming the head or outer collarof the pin,

and-by which said pin is made adjustable in the wheel for shortening .orlengthening the stroke of the connecting-rod, for a purpose presentlyshown. The shaft carrying the crank-wheel has its bearings in the sleeveH of the bracket, and is driven by a pulley or wheel, I. The lower-endof section b of the vibrating head is a cleft socket, h, Fig. 4,

within which is fitted and secured by a band or clip, g, the stem J ofthe cutter O. Said cutter is formed at the lower end as will be seen at0, Fig. 6, the shape of which is that of a chisel having a basil "onlyon one side, and the cutting-edge oblique to the sides of the chisel,thereby forming one pointed corner, as seen in Fig. 2. The lower part ofthe stem of. the cutter is held loosely in a guide, K. Said guide ispivoted to the arm L, so that it may vibrate, and thereby adjust itselfto the vibratory movement of the stem of the cutter. M, Fig. 6, is abracket, whereon is secured an adjustable block, N, by means of thescrews h, which permits of its adjustment near to or away from thecutter-O by means of the adjusting-screws a. In said block is secured,by a setscrew, c, a cutter, P, corresponding in character to the cutterO, wherewith it oo-operates for cutting. The relative position of thetwo cutters in respect to each other is such as shown in Fig. 6, whereinit will be seen that the plain or straight sides thereof slide upon eachother as a pair of shears, and that the cutting-edges have the sameoblique angle, and in the same direction, thereby bringing the twopointed corners in close proximity to each other.

Having described the construction of the scroll-cutter, the practicaloperation of the same is as follows: A sheet of metal on which thedesign of a scroll is traced is laid. under the reciprocating vibratorycutter, 0, which for that purpose is lifted from its contact withthelower one by means of the handle Q, attached to the end of the eccentricshaft 0. By turning said handle to the position indicated by the dottedline cl, Fig. 2, it will turn the eccentric side or swell of the shaftupward, thereby lifting the head referred to so far as CORNICE ANDORNAMENT to permit the introduction of the sheetbe tween the twocutters, the upper onetof which continuesto operate by virtueof'itsconnection with the head, which is vibrated by the j connecting-rodE and crankwheel, thereby giving a reciprocatin g vertical action to thecutter, whether itb'e raised above the lower one ordown in cuttingrelation therewith, When "theshee't of metalis interposed between thecutters the eccentric shaft 0 is turned by the handle Q, thereby pushingthe upper cutter down and bringing it in: contact with the sheet. Theupper cutter, in its relation to the lower one, acts conjointlytherewith as a shear,whereby the metal is cut through along y the linesof'the design as the sheet is moved about by the operator. Thecutting-blades being very narrow, no trouble is found in cut- ,tingquick curves and acute angles that may formany part of the scrolldesign, the cutting of which can be commenced at any place in a ,thework without cutting infrom the side or y the sheet to reach the linesof design by simply lifting the reciprocating cutter from its,contactwith the lower or stationary one, so

sired. a l i a a a What we claim as our inventiomand desire that thesheet may be interposed between them. The length of the stroke of thecutter can be Varied by shifting :the wrist-pin G, to which the rod E isconnected, along in the groove'of the crank-wheel, toward or away fromthe center of the wheel, as may be deto'secure by Letters Patent,is it1 1. In sheet-metal-scroll cutters, the cojmbination of the sections a bof the head, eccenshaft c, rodE,stem J, and, cutters, operatingconjointly substantially as and forl the purpose set forth. 1

2. The combination of the grooved crankwheel F, adjustable wrist-pin Gr,connecting rod E, and the vibratory head, consisting of l sections a b,in the manner as describedyand set forth. a

WM. H. CLARK. y

WILLIAMJ. CLARK. ANSON O. KITTREDGE.

for the purpose Witnesses:

R.;H. GABRIGUES, R. J. THOMSON.

